Investigation of crackling noise in the vibration isolation systems of the KAGRA gravitational wave detector

Gravitational wave detectors, such as KAGRA, require complex mirror suspension systems to reach high sensitivity. One particular concern in these suspensions is the presence of crackling noise, where motion steel crystal structure disturbs material defects, causing impulse force release and exciting motion. Crackling Geometric Anti Spring filters (GAS) KAGRA's system could introduce noise gravitational detection band. We investigate a miniature GAS with low-frequency cyclical stress. developed scaling law between KAGRA GAS. Applying experimental results allows us estimate upper limit KAGRA. It found that should be below target sensitivity for waves above 60 Hz.